摘要
针对U型箍筋抗剪试验缺乏强度折减实践依据的问题，设计15个配有BFRP箍筋的C30混凝土U型试件。在BFRP箍筋两侧用套筒将其锚固，弯折成U型，箍筋两端采用穿心千斤顸施加荷载，逐渐加载至BFRP箍筋破坏。通过分析试验数据，建立试件受力模型，可知弯折部位锚固长度对BFRP箍筋强度折减有较大影响，最大折减为原强度的65％；随着锚固长度的增加，BFRP箍筋强度呈线性增加至某个定值；最后推导出U型BFRP箍筋强度折减公式。
Aiming at the absence of practical basis of strength reduction for the U-shaped stirrup shear experiment, the re- search has designed 15 U-shaped BFRP stirrup specimens of C30 concrete. The BRFP bar is bent into U-shaped stirrup with both sides of the BFRP stirrup＇ s sleeve anchor, and is gradually loaded by the jack on both ends of the mandrel to destruction. By analyz- ing the experimental data, a mechanical model of component is established. What＇ s more, the strength reduction of the BFRP stir- rup is obviously affected by the anchorage length of bent parts, and the ultimate reduction can reach 65%. With the anchorage length increase, BFRP stirrups strength increases linearly to a certain of constant value. Finally, the formula for U-shaped BFRP stir- rup strength reduction calculation is deduced.
出处
《后勤工程学院学报》
2012年第4期14-18,90,共6页
Journal of Logistical Engineering University
基金
重庆市科技攻关计划重点资助项目(CSTC,2011AB0043)
关键词
混凝土试块
U型箍筋
抗拉强度
试验分析
concrete block
U-shaped stirrup
tensile strength
experimental study
